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Welcome to the official Square Foot Gardening Forum.
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I remember when I was young my uncle send me to pick so vegetables from winter vegetable storage.Storage was made in the ground about 3'-4' deep 2 ' W x 5'L full with sand, on top cover with strawInside there was many root vegetables . ... nice fresh looks like you just get it from a garden.

Storey Publishing put out a great booklet called Build Your Own Underground Root Cellar by Phyllis Hobson. I love their booklets, I have at least a dozen of them. The ISBN is 978-0-88266-290-9. It's definitely on my "Things I Dream Of" list!